题目内容
如图所示,质量为m的带电滑块,沿绝缘斜面匀速下滑。当带电滑块滑到有着理想边界的方向竖直向下的匀强电场区域时,已知电场力的大小小于重力,则滑块的运动状态为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241249192742636.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241249192742636.jpg)
A.将减速下滑 |
B.将加速下滑 |
C.将继续匀速下滑 |
D.前述三种情况都可能 |
C
滑块进入电场前匀速下滑:
,则![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124919306303.gif)
滑块进入电场后将受到竖直方向的电场力Eq;
(1)若滑块带正电,有
,仍匀速下滑;
(2)若滑块带负电,有
,仍匀速下滑。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124919290631.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124919306303.gif)
滑块进入电场后将受到竖直方向的电场力Eq;
(1)若滑块带正电,有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124919321859.gif)
(2)若滑块带负电,有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124919352845.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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